<pre>  /**
   * The constants used in this Content Widget.
   */
  public static interface CwConstants extends Constants {
    String cwFlowPanelDescription();

    String cwFlowPanelItem();

    String cwFlowPanelName();
  }

  /**
   * An instance of the constants.
   */
  private final CwConstants constants;

  /**
   * Initialize this example.
   */
  @Override
  public Widget onInitialize() {
    // Create a Flow Panel
    FlowPanel flowPanel = new FlowPanel();
    flowPanel.ensureDebugId("cwFlowPanel");

    // Add some content to the panel
    for (int i = 0; i &lt; 30; i++) {
      CheckBox checkbox = new CheckBox(constants.cwFlowPanelItem() + " " + i);
      checkbox.addStyleName("cw-FlowPanel-checkBox");
      flowPanel.add(checkbox);
    }

    // Return the content
    return flowPanel;
  }

</pre>